Etude sur les fluctuations de température relevées dans 25 compartiments de maternité et de post-sevrage

in 24èmes Journées de la Recherche Porcine en France (1992)

Temp. was measured for 7 days, every 20 min., in 20 farrowing houses and 5 weaning houses. The mean stocking rate in the farrowing houses was 70% and the air space per litter (1 sow and 8 piglets) 25 m ... [more ▼]

Temp. was measured for 7 days, every 20 min., in 20 farrowing houses and 5 weaning houses. The mean stocking rate in the farrowing houses was 70% and the air space per litter (1 sow and 8 piglets) 25 m. In the weaning houses the mean stocking density was 84% and the air space per piglet 1.3 m. Four different heating systems were used: radiators, floor heating, gas heaters and aerotherms. Artificial ventilation was provided in 88% of the compartments and natural ventilation in the others. The mean inside and outside temp. were 22 2 and 106C resp. A good estimate of the mean daily temp. was provided with only the min. and max. daily records. No more than one measurement per h was needed to assess the daily variations. The mean daily temp. range inside the buildings was 33C, ranging from 1 to 11C. The largest inside temp. variations were observed with high and fluctuating outside temp. On an hourly, daily or weekly basis, the outside temp. range was reduced by two thirds. This value can be used as a reference to judge the ability of the building and its equipment to maintain a constant inside temp. [less ▲]

Etude sur les fluctuations de température relevées dans 5 locaux de post-sevrage en porcheries

in Annales de Médecine Vétérinaire (1991), 135(7), 511-515

Temperature was measured during 7 days, every 20 minutes, in 5 rooms of 3 weaning houses. All the rooms were artificially ventilated but they differed by their stocking rate which ranged from 0.5 to 2.3 ... [more ▼]

Temperature was measured during 7 days, every 20 minutes, in 5 rooms of 3 weaning houses. All the rooms were artificially ventilated but they differed by their stocking rate which ranged from 0.5 to 2.3 m3 per animal. The mean inside and outside temperatures were 23 +/- 3-degrees-C and 13 +/- 8-degrees-C. The outside temperature range was reduced, on average, by 60% either on a daily or a weekly basis. In terms of absolute values, the daily range varied from 2 to 80-degrees-C according to the room. An accurate estimate of the mean daily temperatures was already provided by just the minimum and maximum records. Only one measurement per hour was needed to assess the daily variations. Advices related to the stability of temperature in the rooms have to be expressed in relative terms rather than in absolute values. A 60% reduction of the outside temperature range can be suggested as a reference. [less ▲]

Etude du microclimat et de la ventilation d'une porcherie d'engraissement

in 23èmes Journées de la Recherche Porcine en France (1991)

Temperature, relative humidity and air speed were measured during 4 weeks in two compartments of a fattening pig house. Temperature was controlled by automatic regulation of the extractor fan. Average NH3 ... [more ▼]

Temperature, relative humidity and air speed were measured during 4 weeks in two compartments of a fattening pig house. Temperature was controlled by automatic regulation of the extractor fan. Average NH3 and CO2 concentrations over a 8-h period were measured 4 times in each compartment at 1-week intervals. In a compartment without pigs, ventilation rate was measured at 8 fan speeds and air speed was measured in 6 pens. Mean temperature was 24C and relative humidity 71%. despite large variations of outside temperature, 95% of the daily variations of inside temperature were <6C and 68% of the hourly variations were <0.5C. More than 90% of the daily variations of relative humidity were <20%. Thermal regulation with the fan was therefore effective. Mean NH3 concentration was higher than the usual recommendations, 26(vs 20) ppm and the CO2 concentration lower, 1688 (vs 3000) ppm. Measurements of ventilation rate showed that the air inlet area was too small for the maximum power of the fan. The ventilation rate was at most 3200 m/h for 78 pigs. Air speeds higher than 0.2 m/s were also measured 0.5 m above the floor in some of the 6 pens. These excessive values could be related to air inlet area. [less ▲]

Les caractéristiques de l'air sain: difficiles à fixer

Article for general public (1990)

Niveaux de pollution en ammoniac, gaz carbonique et bactéries dans l'air des locaux de maternité et de post-sevrage

in 22èmes Journées de la Recherche Porcine en France (1990)

Exemple de résultats inattendus lors d'un contrôle de la concentration en ammoniac dans une porcherie

in Annales de Médecine Vétérinaire (1989), 133(7), 613-616